Definition of 'tube'

Noun

1. conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
      Synonyms: tubing
2. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
      Synonyms: vacuum tube thermionic vacuum tube thermionic tube electron tube thermionic valve
3. a hollow cylindrical shape
      Synonyms: pipe
4. (anatomy) any hollow cylindrical body structure
      Synonyms: tube-shaped structure
5. an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
      Synonyms: metro underground subway system subway

Verb

1. provide with a tube or insert a tube into
2. convey in a tube; "inside Paris, they used to tube mail"
3. ride or float on an inflated tube; "We tubed down the river on a hot summer day"
4. place or enclose in a tube

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